Unpulsed UBV Optical Emission from the Crab Pulsar

Details Unpulsed UBV Optical Emission from the Crab Pulsar Unpulsed UBV Optical Emission from the Crab Pulsar

1999-12-16

arxiv.org/abs/astro-ph/9912355v1

Astronomy and Astrophysics

Astrophysics

26 pages, 2 figures, uses aasms4.sty, accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/308826

Based on observations of the Crab pulsar using the TRIFFID high speed imaging photometer in the UBV bands using the Special Astrophysical Observatory's 6m telescope in the Russian Caucasus, we report the detection of pronounced emission during the so-called `off' phase of emission. Following de-extinction, this unpulsed component of emission is shown to be consistent with a power law with an exponent of alpha = -0.60 +/- 0.37, the uncertainty being dominated by the error associated with the independent CCD photometry used to reference the TRIFFID data. This suggests a steeper power law form than that reported elsewhere in the literature for the total integrated spectrum, which is essentially flat with alpha ~ 0.1, although the difference in this case is only significant at the ~ 2 sigma level. Deeper reference integrated and TRIFFID phase-resolved photometry in these bands in conjunction with further observations in the UV and R region would constrain this fit further.

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